In some cases, the timer can cause this if it is not sending enough voltage to the agitate windings. The only way to confirm this is to check voltage at the timer between the WHite/Bk wire and the BU wires when the machine should be agitating. If 120 volts is not present, the timer is the issue.

i pulled the motor, reinspected the coupling, manually cranked both sides of the motor, manually cranked whatever the coupling attaches to on the back side of the motor (both directions). this moved the agitator which i had not seen before. after reconnecting motor - it worked. hallelujah! something must've been frozen/locked.... we did our first laundry load last nite - it's all good (and i learned a lot about washers).